Troubleshooting - DAB KVC Serie Installationsanweisung Und Wartung

7.7 Stopping
Close the interception device on the delivery pipe. If there is a check device on the delivery pipe, the interception valve on
the delivery side may ramain open as long as there is back. For a long period of inactivity, close the interception device on the intake pipe and, if
supplied, all the auxiliary control connections.
7.8 Precautions
The electropump should not be started an excessive number of times in one hour. The maximum admissible value is as follows:
When the pump remains inactive for a long time at temperatures of less than 0°C, the pump body must be completely emptied through
−
the drain cap.
Check that the leakage of liquid does not damage persons or things, especially in plants that use hot water.
It is recommended to empty the pump when it is not running for a long time at normal temperature.
−
The drain plug shall be opened until the pump will be utilized again.
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When restarting after long periods of inactivity it is necessary to repeat the operations described above in the paragraphs WARNINGS
−
and STARTING UP.
8. MAINTENANCE
In normal operating conditions the electropump does not require any kind of maintenance.
−
It is recommended to check time by time current absorption, pressure head at closed valve and maximum flow.
−
The electropump can only be dismantled by specialised, skilled personnel in possession of the qualifications required by the specific
regulations.
In any case all repair and maintenance jobs must be carried out only after having disconnected the pump from the power mains.
−
If the liquid has to be drained out maintenance, ensure that the liquid coming out cannot harm persons or things, especially
in using hot water.
The legal requirements on the disposal of any harmful fluids must also be complied with.
8.1 Modifications and spare parts
Any modification not authorised beforehand relieves the manufacturer of all responsibility. All the spare parts must be authentic and all the
accessories must be authorised by the manufacturer.
Carry out maintenance based on the type of bearing indicated on the technical data plate.

9. TROUBLESHOOTING

Fault
The motor does not start and makes no
noise.
The motor does not start but makes
noise.
The motor turns with difficulty.
The (external) motor protection trips
immediately after starting.
The motor protection trips too frequently.
ENGLISH
Type of pump Maximum number of starts per hours
KVC - KVCX
Check (possible cause)
− Check the protection fuses.
− Check the electric connections.
− Check that the motor is live.
− Motor protector cut-off the motor, for the
single-phased motors, due to over heating of
tag windings.
− Check that supply voltage correspond with
voltage on the pump label.
− Check the electrical connections.
− Check that all the phases are present.
− Check for obstructions in the pump or motor.
− Verify that supply voltage is at an acceptable
valve.
− Check whether any moving parts are
scraping against fixed parts.
− Check the state of the bearings.
− Check that all the phases are present.
− Look for possible open or dirty contacts in the
protection.
− Look for possible faulty insulation of the
motor, checking the phase resistance and
insulation to earth.
− Ensure that the environment temperature is
not too high.
− Check the calibration of the protection.
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If they are burnt-out, change them.
Correct any errors.
Wait for automatic reset of the motor protector
once the temperature has fallen below the
maximum limit.
Correct any errors.
Restore the missing phase.
Remove any obstructions.
Eliminate the cause of the scraping.
Change any worn bearings.
Restore the missing phase.
Change or clean the component concerned.
Change the motor casing with the stator or reset
any cables discharging to earth.
Provide suitable ventilation in the environment
where the pump is installed.
Calibrate at a current value suitable for the
motor absorption at full load.
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Remedy